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Sean,
A few others besides NASCAR & USAC Include:
Grand Am, ALMS, NHRA (Classes over 150mph I believe) F-1 and some other FIA sanctioned classes. I believe the CRA may be adding a requirement as well for some classes. IRL, does not have it in it's rules yet, but all drivers are using the Hans as is the case in ChampCar.
Ken Joyce
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